Gear Table

{
  "asOf": "2026-10-12T01:50:57.447Z",
  "averageStepPercent": 7.27,
  "cadenceRpm": 90,
  "circumferenceMm": 2105,
  "combinations": 20,
  "degraded": false,
  "disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
  "highestGear": {
    "chainring": 50,
    "cog": 11,
    "gearInches": 119.9,
    "ratio": 4.545,
    "speedKmh": 51.7
  },
  "largestStepPercent": 16.7,
  "lowestGear": {
    "chainring": 34,
    "cog": 28,
    "gearInches": 32,
    "ratio": 1.214,
    "speedKmh": 13.8
  },
  "nearDuplicateGears": 0,
  "notChecked": [
    "cross-chaining (big-big and small-small combinations that wear the chain)",
    "front and rear derailleur capacity",
    "…1 more"
  ],
  "rangePercent": 374.4,
  "reasons": [
    "Gears are sorted by ratio; steps are the percentage jump from one gear to the next higher one."
  ],
  "sortedByRatio": [
    {
      "chainring": 34,
      "cog": 28,
      "gearInches": 32,
      "ratio": 1.214,
      "speedKmh": 13.8
    },
    {
      "chainring": 34,
      "cog": 24,
      "gearInches": 37.4,
      "ratio": 1.417,
      "speedKmh": 16.1
    }
  ],
  "source": "computed locally (ratio x circumference)",
  "summary": "20 combinations from 32 (34/28) to 119.9 gear inches (50/11); range 374%.",
  "verdict": "COMPUTED"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://bike-calc.x402tookit.com/gear-table?chainrings=50%2C34&cogs=11%2C12%2C13%2C14%2C15%2C17%2C19%2C21%2C24%2C28'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - 'https://bike-calc.x402tookit.com/gear-table?chainrings=50%2C34&cogs=11%2C12%2C13%2C14%2C15%2C17%2C19%2C21%2C24%2C28' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.02 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.02" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.02 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fbike-calc.x402tookit.com%2Fgear-table
const res = await pay("https://bike-calc.x402tookit.com/gear-table?chainrings=50%2C34&cogs=11%2C12%2C13%2C14%2C15%2C17%2C19%2C21%2C24%2C28");
console.log(res.status, await res.text());

# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.02 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.02"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://bike-calc.x402tookit.com/gear-table?chainrings=50%2C34&cogs=11%2C12%2C13%2C14%2C15%2C17%2C19%2C21%2C24%2C28")
    print(res.status_code, res.text)